THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 47 
Minerals (2.30 per cent); the mineral particles here may be roughly 
divided into two groups according to size,—one has a mean diameter of 
0.12 mm., the other about 1 mm. There are two fragments of rock, 2 and 
3mm. in diameter, irregular, with blunted edges, brown and soft, repre- 
senting a decomposed volcanic rock, and consisting essentially of limonite 
and a glassy base, in which augite and a tabular isotropic mineral are ob- 
served. To these fragments are firmly attached Sponge spicules forming 
on their surface a reticulated design. The minerals proper consist of quartz, 
in fragments sometimes 1 mm. in diameter, with blunted edges, augite, a 
little plagioclase, a few flakes of a chloritic mineral, and a good many man- 
ganese grains. Many splinters of colorless volcanic glass were also ob- 
served, in addition to flakes of hematite. 
Fine Washings (96.70 per cent), yellowish-gray clayey matter, with a 
few small mineral particles. 
No. 10. Station 4671, 20th November, 1904. 
Lat. 12° 6.9’ S.; long. 78° 28.2’ W.; depth, 1490 fathoms. 
BLUE MUD: dark green when wet, very soft to the touch, and plastic, 
but not sticky ; when dried, slightly coherent and light gray in color with a 
faint green tinge. 
CALCIUM CARBONATE : 0 per cent. 
ResipvE: 100 per cent : — 
Siliceous Organisms (0.5 per cent), only Diatoms were observed. 
Minerals (0.5 per cent), very few, angular and varying in size, mostly 
quartz and glauconite, with a little felspar, magnetite, and hematite. 
Fine Washings (99 per cent), fine greenish-colored clay, containing 
many very minute mineral particles, 0.01 mm. in diameter, and Diatoms. 
No. 11. Station 4672, 21st November, 1904. 
Lat. 13° 11.6’ §.; long. 78° 18.3’ W.; depth, 2845 fathoms. 
RED CLAY (might be called Blue Mud): gray, plastic, sticky, smooth 
to the touch; dries into light-gray lumps difficult to break. The deposit has 
undergone a kind of decomposition in the bottle, as parts of it have turned 
nearly black. 
CALCIUM CARBONATE: 0 per cent. 
ResipuE: 100 per cent : — 
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